Moisture-proof electric motor, dynamo, and the like.



PATENTED JULY 23, 1907.

1". w. BLLS. MOISTURE PROOF ELECTRIC MOTOR, DYNAMO, AND THE- LIKE.

APPLICATION FILED MAY 2,1906.

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UNITED sra rns PATENT OFFICE.

FREDERICK W. ELLS, Oi" MILWAUKEE, WISCONSIN.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed May 2,1996. Serial N0. 314,7?6.

lb all whom it may concern:

Be'it known that I, FREDERICK W. ELLE, residing in vlilwaukee, 'in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Moisture-Proof Electric Motors, Dynamos, and

' adapted to motors used in connection with railway signal devices,wher ein the motors are exposed to the ele 'ments, and consequently must be well protected in or der to preserve their efficiency, and this with the minimum attention being necessary.

In using electric motors in connection with railway signal deviccs,'it has been found necessary to use what is known as the inclosed typo motors, and it has also been found necessary in this type of motor to prevent the gathering of moisture within the motor casiu g.

My invention contemplates not only a means for preventing as far as possible the accumulation of moisture within the casing, but furthermore provides means for absorbing the moisture from the air within the casing and keeping the interior perfect-1y dry, thus prolonging theliie of the motor by preventing the iron parts from rusting and the insulations from rotting a way.

. The improved means devised by me also prevents the commutator and brushes of the motor from becoming coated with frost.

Another object is to prevent a film of frost gathering on the commutator and brushes in cold weather, preventing the passage of current from the brushes to the commutator, and the armature from rotating. Motors of this class operate upon low voltage, and unless the-interior is kept perfectly dry in opld weather a-film of frost will gather between the brushes and the counuutator when the motor is at rest, thereby preventing the pas- :sage of current when the switch is closed.

In'the accompanying drawing, Figure 1. is a longitudinal, vertical section of my invention; and Fig. 2 is a central, vertical section taken at right angles to Fig. 1. u Referring to the drawing, the numeral 3 indicates the mainframe 'ofjan 'inelosed type electric motor, provided with usual field-cores 4, 4, and a base or support 5,

'5 havin'gan opening 6, provided with 'a cap 7 bolted to the base support by means of bolts 8, 8.

A chamber 9 within the base or support 5 is provided in the topwal'l thereof with an opening 10 communicating with-the field chamber 11. To the main frame is bolted a plate 1-2, provided with aball bearing 13 adapted to receive and support one end of the armature shaft 14, which shaft is provided with the usual cone to engage the ball hearing; The plate 12 and its hall bearing form practieallya moisture-proof inelosure and bearing for this end of the shaft. Extending from plate 12 is an additional guard or support 15 for the shaft 14, the said shaft having a hearing thgn-cin. To the main frame 3. at the opposite end thereof, is bolted a casting 16 provided with two extensions 17 (one only being shown in the drawings) said extensions supporting, and-having integral therewith, a plate 18, provided with a ball hearing 19 adapted to support the other end of the shaft 14, the said shaft. being provided with another conosimilar to tho one llcl'ciu bei'orc referred to. Plate i8 als has an :ulditional guard or support 20 extending then-from and through which the shaft: 1 puss-cs. Threaded to the plate 1.8 is a nut 21 provided uponrecess a gasket is placed, to form a nulisturo-prool joint.

between the nut 21 and the short glass tube 23. The Y opposite cud of the glass tube 23 fits against a corrcspending gasket 2-1 in a recess 25 in the casting 16, thus providing a moisture-proof joint. at; this end of the glass.

It. will hem-on that. the arn'mgcmmit of parts described provides u very simple means for viewing the (ZUlllllllltut-o1 26 or tllp l)l'll: li -S 27 (one only being shown), through th transpar nt tube 2,3, or the armature 28 through said tube :33, and through thc opening 29, without (.list-urhing any part. of Inmotor.

The description thus for provides for a motor casing which moisturn-proof as fur as plucticablc, but does not dcscrihe'us yet. means for taking up the moisture in the air which might. get into the interior of the motor casing through the bczuiugsru' joints. To take care of this moisture, l have provided the chamber 5) in the base or support having a communicating opening with the motor interior and adapted to receive through the capped opening 6 a metal receptacle containing calcium chlorid, calcium ciirbid, lime, or any chemical or compound Which has an affinity for moisture; ical or compound in. the receptacle will absorb all the moisture within-the chamber 11, therohy keeping the interior of the motor perfectly dry for a long period of time without attention from the attendant, and preventin g dULPIlOILIIlIlOIl of any of the parts or coating with frost.

For convenience the word nrptorj will be used throughout all the claims, but it is'to be understood that thisinvention is applicable to apy like electric lovice ,,und the claims are to bc so construed i What; I claim as my invention is: s

1. An electric motor 151" vlded with an inclosure, a

transparent sight portion f rming part 01' said l'nclosure,

a chamber hnving communication with the inclosure, and a material which has an affinity for moisture contained within snionchamber and adapted to absorb the moisture within the inclosure.

2.- An electric motor provided with an fnclosur chamber having communication with said luclosur material which has an afiinfty'tor moisture con within the chamber, and a glass tube forming part-'M gthe;

fnclosure' and adapted to [be used as a. sight opening.

3. In an electric gmotor, the combination or a limo The chem-' trams, s latsrovisos with a. pour n misuse thereto, s:

casting provided with a bearing and with a sight opening, said rusting also attached to the muin frame, a transparent rover for said opening, a chamber having communication with the lnclosul-e formed by the before-mentioned parts,

a receptacle within said chamber, and a material which.

has an uiiinit'y for tacle. 4. In an electric motor 01' the inclosed type, the combination of a main frame. a plate provided with a bearing attached thereto, a casting provided with a hearing and a sight opening, frame, a transparent cover for said opening, a chamber hnvingcommuniontlon with the inelosure formed by the betore'mcnilmmri parts, said chamber provided with s. capped openlngnnd a material haiving'aiflnity for moisturecontained within the chamber.

moisture'contained within said recepsold casting also attached to the mainof two witnesses.

nnnnnsrcn .ivl new. Witnesses.

A. L. Monsmnn, ANNA E. Scnmn'rnwnn. 

